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The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle. The axillary nerve is formed by fibers of the C5 to C6 roots which go through the posterior cord of the plexus and innervate the deltoid and teres minor muscles, as well as part of the skin of the lateral shoulder.
The vagus nerve innervates the larynx, the pharynx, the upper part of the oesophagus, the part of the external hearing apparatus, the heart, the lungs, the stomach, the intestine and even several muscles. The accessory nerve, known as the eleventh cranial nerve, is a motor nerve, that regulates the muscular activity.he vagus nerve, or tenth cranial nerve, is the longest and most important nerve of the parasympathetic nervous system (it belongs to the neurovegetative system) as it regulates the functions of almost all of the internal organs.